Windows上的Python - 如何等待多个子进程？

问题描述

如何等待Windows上Python中的多个子进程，没有主动等（轮询）？事情是这样的几乎的工作对我来说：

How to wait for multiple child processes in Python on Windows, without active wait (polling)? Something like this almost works for me:

proc1 = subprocess.Popen(['python','mytest.py'])
proc2 = subprocess.Popen(['python','mytest.py'])
proc1.wait()
print "1 finished"
proc2.wait()
print "2 finished"

问题是，当 PROC2 在 PROC1 结束，父进程将仍然等待 PROC1 。在Unix人会使用 waitpid函数（0）在一个循环中获得子进程的回归codeS为他们完成 - 如何实现在Python这样的事情在Windows ？

The problem is that when proc2 finishes before proc1, the parent process will still wait for proc1. On Unix one would use waitpid(0) in a loop to get the child processes' return codes as they finish - how to achieve something like this in Python on Windows?

推荐答案

这似乎矫枉过正，但这里有云：

It might seem overkill, but, here it goes:

import Queue, thread, subprocess

results= Queue.Queue()
def process_waiter(popen, description, que):
    try: popen.wait()
    finally: que.put( (description, popen.returncode) )
process_count= 0

proc1= subprocess.Popen( ['python', 'mytest.py'] )
thread.start_new_thread(process_waiter,
    (proc1, "1 finished", results))
process_count+= 1

proc2= subprocess.Popen( ['python', 'mytest.py'] )
thread.start_new_thread(process_waiter,
    (proc2, "2 finished", results))
process_count+= 1

# etc

while process_count > 0:
    description, rc= results.get()
    print "job", description, "ended with rc =", rc
    process_count-= 1

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